Flow cytometric analysis of herpes simplex virus type 1 susceptibility to acyclovir, ganciclovir, and foscarnet

被引:34
作者
Pavic, I [1 ]
Hartmann, A [1 ]
Zimmermann, A [1 ]
Michel, D [1 ]
Hampl, W [1 ]
Schleyer, I [1 ]
Mertens, T [1 ]
机构
[1] UNIV ULM,INST MIKROBIOL,ABT VIROL,D-89081 ULM,GERMANY
关键词
D O I
10.1128/AAC.41.12.2686
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
We established a quantitative flow cytometric method for determination of herpes simplex virus type 1 (HSV-1) susceptibility to acyclovir (ACV), ganciclovir, and foscarnet in vitro. Susceptibility was defined in terms of the drug concentration which reduced the number of cells expressing HSV-1 glycoprotein C (gpC) with a fluorescence intensity of greater than or equal to 10(2) by 50% (IC50). Flow cytometry allowed us to use a high (1.0) as well as a low (0.005) multiplicity of infection, and determination of the IC50 was possible after one or more viral replicative cycles. IC(50)s were dependent on virus input and on time postinfection. In mixture experiments, 1 to 2% resistant viruses added to a sensitive strain could be detected. The results obtained by flow cytometry showed a good qualitative correlation with those achieved by cytopathic effect inhibitory assay. However, flow cytometry might detect more quantitative differences in drug susceptibility, especially among resistant strains, as confirmed also by determination of intracellular drug phosphorylation. The mean IC(50)s for ACV-sensitive strains were 0.45 to 1.47 mu M, and those for ACV-resistant strains were between 140 and 3,134 mu M. Flow cytometric analysis was fast and accurate, automatizable, and highly reproducible. Flow cytometry may be a more powerful tool than standard cytopathic effect-based assays and could have advantages for the detection of low levels of drug resistance or mixtures of sensitive and resistant virus strains.
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页码:2686 / 2692
页数:7
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